First time growing autos. Medium is coco with worm castings, dr earth dry amendments (444 and 394). PH 6.5. Temp 74-79. They are exactly 5 weeks old. I noticed the problem over the last few days. They just received a feeding yesterday with more 394, very little 444 and worm castings. I assume if it was a nute problem there would have been signs earlier since the only feeding took place when they were planted 5 weeks ago. Like I said, I noticed the problem a few days before I fed them again, so the problem wouldn't be new nutrients. and gave them a feeding yesterday since they were starting to flower. Thought about adding more coco to introduce some microorganisms. Anyone offer advice??? Nitrogen toxicity? Watering issue?